Abstract
Electrical signals (action potential and variation potential, VP) caused by environmental stimuli are known to induce various physiological responses in plants, including changes in photosynthesis; however, their functional mechanisms remain unclear. In this study, the influence of VP on photosynthesis in pea (Pisum sativum L.) was investigated and the proton participation in this process analysed. VP, induced by local heating, inactivated photosynthesis and activated respiration, with the initiation of the photosynthetic response connected with inactivation of the photosynthetic dark stage; however, direct VP influence on the light stage was also probable. VP generation was accompanied with pH increases in apoplasts (0.17-0.30 pH unit) and decreases in cytoplasm (0.18-0.60 pH unit), which probably reflected H(+) -ATPase inactivation and H(+) influx during this electrical event. Imitation of H(+) influx using the protonophore carbonyl cyanide m-chlorophenylhydrazone (CCCP) induced a photosynthetic response that was similar with a VP-induced response. Experiments on chloroplast suspensions showed that decreased external pH also induced an analogous response and that its magnitude depended on the magnitude of pH change. Thus, the present results showed that proton cellular influx was the probable mechanism of VP's influence on photosynthesis in pea. Potential means of action for this influence are discussed.
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Claims 11
Claim · model-written summary
Variation potential induced by local heating inactivated pea photosynthesis.
- Taxon
- pea
Lathyrus oleraceust0 - Treatment
- local heatinge0
- Outcome
- photosynthesise0
- Direction
- inactivatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“VP, induced by local heating, inactivated photosynthesis and activated respiration”
t0“pea”
Claim · model-written summary
Variation potential induced by local heating activated pea respiration.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- local heatinge0
- Outcome
- respiratione0
- Direction
- activatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“VP, induced by local heating, inactivated photosynthesis and activated respiration”
t0“pea”
Claim · model-written summary
Initiation of the photosynthetic response was connected with inactivation of the dark stage.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- photosynthetic responsee0
- Qualifier
- inactivation of the photosynthetic dark stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the initiation of the photosynthetic response connected with inactivation of the photosynthetic dark stage”
t0“pea”
Claim · model-written summary
Direct variation-potential influence on the light stage was considered probable.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- light stagee0
- Qualifier
- direct VP influencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“direct VP influence on the light stage was also probable”
t0“pea”
Claim · model-written summary
Apoplastic pH increased by 0.17-0.30 pH unit during variation-potential generation.
- Taxon
- peaLathyrus oleraceust0
- Outcome
- pH increases in apoplastse0
- Direction
- increasese0
- Value
- 0.17-0.30 pH unite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“VP generation was accompanied with pH increases in apoplasts (0.17-0.30 pH unit)”
t0“pea”
Claim · model-written summary
Cytoplasmic pH decreased by 0.18-0.60 pH unit during variation-potential generation.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- cytoplasme0
- Outcome
- pHe0
- Direction
- decreasese0
- Value
- 0.18-0.60 pH unite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases in cytoplasm (0.18-0.60 pH unit)”
t0“pea”
Claim · model-written summary
The pH changes probably reflected H(+)-ATPase inactivation and proton influx.
- Taxon
- peaLathyrus oleraceust0
- Gene
- H(+) -ATPasee0
- Outcome
- H(+) influxe0
- Qualifier
- during this electrical evente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which probably reflected H(+) -ATPase inactivation and H(+) influx during this electrical event”
t0“pea”
Claim · model-written summary
CCCP imitation of proton influx induced a photosynthetic response similar to that induced by variation potential.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- carbonyl cyanide m-chlorophenylhydrazone (CCCP)e0
- Outcome
- photosynthetic responsee0
- Comparator
- VP-induced responsee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Imitation of H(+) influx using the protonophore carbonyl cyanide m-chlorophenylhydrazone (CCCP) induced a photosynthetic response that was similar with a VP-induced response.”
t0“pea”
Claim · model-written summary
Decreased external pH induced an analogous chloroplast-suspension response.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- chloroplast suspensionse1
- Treatment
- decreased external pHe0
- Outcome
- analogous responsee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased external pH also induced an analogous response”
e1“Experiments on chloroplast suspensions”
t0“pea”
Claim · model-written summary
Chloroplast-suspension response magnitude depended on pH-change magnitude.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- chloroplast suspensionse1
- Treatment
- pH changee0
- Outcome
- magnitudee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its magnitude depended on the magnitude of pH change”
e1“Experiments on chloroplast suspensions”
t0“pea”
Claim · model-written summary
Proton cellular influx was identified as a probable mechanism for variation-potential effects on pea photosynthesis.
- Taxon
- peaLathyrus oleraceuse0
- Outcome
- photosynthesise0
- Qualifier
- proton cellular influxe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“proton cellular influx was the probable mechanism of VP's influence on photosynthesis in pea”
The same questions in other papers
heat · physiology: photosynthesis · Lathyrus oleraceus (pea)Positive and negative results
9 papers in the same direction as this paper · 1 in the opposite direction
- negative
- negative
- negative
7 papers more in this group
See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.